Contribute your knowledge to the name Amity

The Amity are a faction in the "Divergent" series which is being translated to film, the first to release in 2014. This may bring some more (positive?) attention to the name.
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Whenever I hear this, I only think of the Amityville Horror House.
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It's also the name of the city terrorized by the shark in Jaws. I think it's a great geographical name and reminds me of the Puritan era.